
Airflow:
Fan
speed
Single fan in free
air
Single fan at
33%
perforation
Two fans at 33%
perforation
m^3/mi
n
CFM
m^3/min
m^3/mi
n
CFM
@ 100%
7.40
261.22
2.96
5.92
208.98
Not used
@ 2/3
4.93
174.15
1.97
3.95
139.32
Fan failure or
over temperature
@1/3
2.47
87.07
0.99
1.97
69.66
Normal
operation
Figure 1
Airflow
performance curves
Item
Description
1
Performance curves, pulse width modulation (PWM) = 100%
2
Static pressure (Pa)
3
Airflow
(m3/minute)
Server
specifications
Chapter 4: Hitachi NAS Platform server components
Hitachi NAS Platform and Hitachi
Unified
Storage Series 4000 Hardware Reference
31